Panasonic EB-X300 Service Manual

Also see for EB-X300: Operating instructions Operating instructions

– 5-8 –The Keypad has a 4 x 5 matrix, allowing 18 keys to be scanned. When a key being pressed, a keypad interrupt is generated.To find which key has been pressed, the software scans each column in turn and reads which row is active. Because of keybounce, the key press is confirmed twice at approximately 40-60 ms intervals.Figure 5.7. Keypad ConnectionsAs the End Key doubles for the ON / OFF key, it is allocated an entire row of the keyboard scan.Keyboard scanning is controlled by software.5.2.4. Subscriber Identity Module (SIM)5.2.3. KeypadThe SIM interface is designed to support a 3 V SIM card. The nominal 2.85 V supply (VSIM) for the SIM interface is provided byU201.0x00 SMSMR SIM Character Mode Register Read/Write0x02 SMBRR SIM Bit Rate Register Read/Write0x04 SMSCR SIM Control Register Read/Write0x06 SMTDR SIM Data Transmit Register Read/Write0x0A SMRDR SIM Data Receive Register Read/Write0x08 SMSSR SIM Status register Read/Write0x0C SMSCMR SIM Smart Card Mode Register Read/WriteKEYCOL_1KEYCOL_2KEYCOL_3KEYCOL_4KEYCOL_0KEYROW_3KEYROW_2KEYROW_1KEYROW_0POWER_KEYSW02[2]1 2SW7[SEND]1 2SW8[POWER][END]1 2SW09[9]1 2SW4[SOFT_RIGHT][SOFT_RIGHT]1 2SW08[8]1 2SW07[7]1 2SW2[DOWN]1 2SW01[1]1 2SW31 2SW06[6]1 2SW12[#]1 2SW05[5]1 2SW00[0]1 2SW1[UP]1 2SW11[∗]1 2SW03[3]1 2SW04[4]1 2